Improvement in elevators



W. K. MARVIN. BLBVATOR.-

10.109,331. Patented Nov. 15, 1870.

tttzt tatzt WALTER K. MARVIN,

on NEW YORK, N.Y.

1 Letters Patent No. 109,331, dated-November 15, 1870.

iMPRovsMl-:Nr IN ELEvA-roRs.

The Schedule referred to' in these Letten Patent and making psrt of thehams.

Tool! whom 'it may concern Beit known that I, WALTER K. MARVIN, of thecity, county, and State of New York, have invented a new and improvedElevator and I do hereby declare that the following is a full, clear,and exact description thereof, which will enable othersskilled in theart to make and use the same, reference being had to the accompanyingdrawing forming part of this specifica-- tion.

My invcntioirconsists ina mode of producing the up and-down movements ofan elevator-carriage'or platformby means of a chain or other weight,which maybe transferred from the carriage or platform to thebalancc-box, or equivalent receptacle for said weight, or 'vice lversa,so as to ina-kei he one heavier than the other, thus causing thecarriage to rise or descend, according as the greater portion of theweight is carried by the boxor by the carriage. y

The manner in which. my invention is or may be carried into effect willhe readily understood by reference vto the accompanying drawing, whichrepresents one mode of lapplying the invention.

Figure l represents a sectional side elevation of my device through thelinea: x, showing the car in the act of descending.

Figure 2 is a vfront elevation of the same.

Figure 3 is a plan'of the same.

Figure 4 is a modification of the device forholdng vthe clutch-lever.

Similar letters of reference indicate corresponding parts. q In thisvcase the letter A represents the frame in which the car B travels, thesaid can being suspended by the cord O which passes over a lixedpulleyon the shaft I), andis secured to the weight-box E, asI shown intheI drawing.'

F represents a chain of suitable weight. 'I he said chain hangs over theloose-pulley G on theshaft D'. The Vsaid chain is provided Awithsufficient slack, so as to allow the .weight of the same to-betransmitted from the balance-box to the car, or from the car to thebalance-box, as the circumstances of the case may require, 'in order toraise or lower the car. j

Hiis a clutch set loose on the shaft D. .'lhe said clutch is operated bya lever, I, which is pivoted at J, the-end of the said lever I-passingthrough the end of the' weighted lever K, which will serve to hold theclutch steady in or out of gear.

Fig. 4 represents a modification' of the device for holding theclutch-lever steady in or out of gear, the 1 said modificationconsisting of a pulley, L, provided with a solid segment, M, in which aslot is made for Vthe purpose of receiving the end of the clutch-leverI.

The brake consists of a male-screw, P, working in a female-screw in thearm N', and bearing against the arm N. ',lhe'said arms are pivoted at Q,and are clamped against the sides of the pulley'O' by means of vallandsrope passing overthe fixed pulley R.

In order to operate this elevator, I first clamp the brake against thepulley O', and then pull the hand-rape S, which will throw the clutch ingear with the wheel '1, which meshes in the wheel U ou 'the shaft V. Ithen pull-the hand-rope W until I have caused a Sudicient amount of thechain F to be transposed frorn t-he balancebox to the car, or fromthecar tothe balancebox,.so as to overcometlie weight to be raised orlowered. I then release the brake, and, by the balancing medium f tbechain, the elevator will 'be moved, and the speed governed by the amountof friction allowed by thegbrake -on the aforesaid pulley.

Having thus describerlrny invention,

That I claim as new, and desire to secure by Leitels Patent, is-

1. Anelevator, in which the carriage and the balance-boxconnectedtherewith are combined witha chain or other weight-and meansfor transferring a greater or lesser portion of said chain or weightfrom the carriage to the balance-box, o r cicc versa, substantially asdescribed, whereby, by the shifting ofthe chain or weight,.the carriage,together with its load, may be caused to rise or descend, as required.

2. The combination, with the elevator-carriage, tue balance-box, thechain or weight, and means for transferring the same, of a brakearranged to he operated from the carriage, so as to-regulate or entirelycheck the movement of the carriage as dcsired,.s`nhstantially as shownand set forth. Y

3, The weighted lever, or its equivalent, as described, in combinationwith the clutch, the chain-pulley, and the shaft upon which the same aremounted, arranged substantially as andl for the'purposes set forth.

4. The brake, constructed, arranged, and operating in the manner and forthe purposes substantially as herein shown and described. l

.The above specification of my invention signed by .me this 13th day ofApril, 1869.

WALTER K. MAR VIN.

